Centrifugal friction coupling



, NdvQ22, 1927. 1,650,201

J. W. A. ELLING ET AL CBNTRIFUGAL FRICTION courune Filed Nov: 50. 1923 Patented Nov. 22, 1927.

UNITED STATES.

I 1,650,201 PATENT j orrlca,

JENS- WILLIAM EGIDIUS ELLING, or onnrsrmnm, AND moan nnenn, or vns'rnn AIKER, NEAR crinrs'rmmmnonwar. I

.' CENTRIFUGAL rn-rcrxon oonrnme.

Application filed November 30, 1923, Serial No. 677,808, and in Norway December 5, 1922.

Our' invention relates to centrifugal friction couplings of the kind in which the power shaft is provided with friction members which are pressed against an interior friction face integral with the driven shaft by centrifugal force so as to carry the latter along with it when reached a predetermined velocity.

The'couplings of this kind have some defect s, the most prominent of wh ch is the difliculty of preventing the friction pieces from being unduly heated when for some reason or other there is slippage between the driven part and the'driving part, while the drif/ing part is continuing its rotation.

Another important defect resides therein that the carrier member fastened to the driving shaft, when the coupling has been used sufliciently long, is friction pieces or clamps a groove of such form that there is a danger of the frlction pieces becoming jammed between their carri er and the friction face of the driven part. The object of our invention is to provide a friction piece free of the defects mentioned above and also to obtain someother advantages in couplings of the kind above men- "tioned, which shall be further explained in the followin 7' I0 In the folfiwing we shall describe our in- 'vention with reference to the accompanying drawings, in which-. Fig. 1 is a longitudinal section on line 1-1 in Fig.2 of a friction piece in accordance. with the invention.

lgig. 2 is a plan view ,of the friction piece an a 1 Figl 3 is a cross section on line in Fig 2. 40 ig. 4 is .a'sectional elevation of a modlfied form of friction piece, taken on line 4-4 of Figl'5. v Fig. 5 is aplan view of the friction piece illustrated in Fig. 4.

, of Fig. 5. V

. Fig. 7 isa vertical sectional viewof the entire coupling, driven by a motor. The general arrangement of the centrifu- 5 gal coupling is illustrated in F-i 7, which shows the work shaft of a circu ar saw 'or the like driven from-an electric motor by the aid of the centrifugal frictioncoupling forming the subject-matter of the present '55 invention.

the power shaft "has liable to'wear out in the Fig. 6 is a sectional view taken on line 6-6 5 is the electric motor, to whose shaft 9 is fastened a hub 6 carrying the arms 4 of the centrifugal friction coupling. The ends of these arms carry the bolts 2 on which the friction or clamping pieces'l'slide. When the electric motor is started, the friction. pieces 1 are thrown outwards toward the inner face of a friction disk 7 fastened to the end of the work shaft, eventually causing this disk to rotate with'the shaft of the motor. In the arrangement shown, the friction disk 7 functions in known manner, as a fiy-wheel for the shaft 8.

Referring now to Figs. 1 to-3, 1 is the friction or clamping piece and 2 is the part of the carrier member, on which the clamping piece is mounted. The interior friction face of the driven member 7 is indicated in- Figures 1 and 4 with a broken circular line and the direction of rotation with an arrow in Fig. 1. Now according to our invention this friction piece 1 is formed in such a way that the heat generated throu h the friction on its friction face owing to s ipping is distributed by the aid of air gaps so as to-prevent the temperature from rising so far asto'be dangerous. In the preferred forms illustrated the friction face is subdivided into two or more sections or ribs 3 of comparatively small peripheral width with intervening air gaps. These ribs as shown are arranged transversely to the direction of movement so as to prevent the formation of long, smooth surfaces excluding the air. The friction piece therefore referably is given the form of a rib-shape body iving the air free access to the parts heated %y the friction.

In the form shown in Figs. 4, 5 and 6, the friction piece is given achannel-shaped cross 95 section.

In order to avoid the risk of the coupling being jammed by the friction piece carrier wearlng out a groove in Its underside the part 2 of the carrier engaging the friction piece is given such a position 1n relation to the part of the friction piece with which it engages that this part 2 (preferably a screw bo t) reaches so far above the said part"(the hub) of the friction iece that a jamming effect by wear is ma e impossible. If by excessive wear the bolt 2 should wear a groove right through the hub part of the riction iece, the only consequence hereof will be, t at the friction piece will' be wholly released from the carrier, causing the machine to stop, and thereby signalling the irregularity.

In the preferred form of the coupling the carrier bolt 2 is threaded through the carrier body proper 4 from within, as illustrated in Figs. 1 and 4, whereby even if the bolt 2 should loosen, it will be kept in place by the influence of the centrifugal force.

Claim:

In a centrifugal friction coupling, a power shaft, a driven shaft, an annular clutch member secured to said driven shaft, said member being provided With an interior friction face, a carrier on the power shaft, 15 and (-hanneLshuped friction pieces adapted to cooperate with said clutch member, said friction-pieces being loosely mounted on said carrier and provided with air gaps in their friction faces.

In testimony that We claim the foregoing as our invention, Wehave signed our names.

JENS WILLIAM IEGIDIUS ELLING.

BJoRN HEGER. 

